593 lines
15 KiB
C
593 lines
15 KiB
C
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/*
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* kerneltop.c: show top kernel functions - performance counters showcase
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Build with:
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cc -O6 -Wall -c -o kerneltop.o kerneltop.c -lrt
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Sample output:
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------------------------------------------------------------------------------
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KernelTop: 2669 irqs/sec [NMI, cache-misses/cache-refs], (all, cpu: 2)
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------------------------------------------------------------------------------
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weight RIP kernel function
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______ ________________ _______________
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35.20 - ffffffff804ce74b : skb_copy_and_csum_dev
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33.00 - ffffffff804cb740 : sock_alloc_send_skb
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31.26 - ffffffff804ce808 : skb_push
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22.43 - ffffffff80510004 : tcp_established_options
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19.00 - ffffffff8027d250 : find_get_page
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15.76 - ffffffff804e4fc9 : eth_type_trans
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15.20 - ffffffff804d8baa : dst_release
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14.86 - ffffffff804cf5d8 : skb_release_head_state
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14.00 - ffffffff802217d5 : read_hpet
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12.00 - ffffffff804ffb7f : __ip_local_out
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11.97 - ffffffff804fc0c8 : ip_local_deliver_finish
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8.54 - ffffffff805001a3 : ip_queue_xmit
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*/
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/*
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* perfstat: /usr/bin/time -alike performance counter statistics utility
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It summarizes the counter events of all tasks (and child tasks),
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covering all CPUs that the command (or workload) executes on.
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It only counts the per-task events of the workload started,
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independent of how many other tasks run on those CPUs.
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Sample output:
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$ ./perfstat -e 1 -e 3 -e 5 ls -lR /usr/include/ >/dev/null
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Performance counter stats for 'ls':
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163516953 instructions
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2295 cache-misses
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2855182 branch-misses
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*/
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/*
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* Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
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*
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* Improvements and fixes by:
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*
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* Arjan van de Ven <arjan@linux.intel.com>
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* Yanmin Zhang <yanmin.zhang@intel.com>
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* Wu Fengguang <fengguang.wu@intel.com>
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* Mike Galbraith <efault@gmx.de>
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* Paul Mackerras <paulus@samba.org>
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*
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* Released under the GPL v2. (and only v2, not any later version)
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*/
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#include "util.h"
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#include <getopt.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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#include <ctype.h>
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#include <time.h>
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#include <sched.h>
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#include <pthread.h>
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#include <sys/syscall.h>
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#include <sys/ioctl.h>
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#include <sys/poll.h>
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#include <sys/prctl.h>
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#include <sys/wait.h>
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#include <sys/uio.h>
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#include <sys/mman.h>
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#include <linux/unistd.h>
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#include <linux/types.h>
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#include "../../include/linux/perf_counter.h"
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/*
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* prctl(PR_TASK_PERF_COUNTERS_DISABLE) will (cheaply) disable all
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* counters in the current task.
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*/
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#define PR_TASK_PERF_COUNTERS_DISABLE 31
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#define PR_TASK_PERF_COUNTERS_ENABLE 32
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#define rdclock() \
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({ \
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struct timespec ts; \
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\
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clock_gettime(CLOCK_MONOTONIC, &ts); \
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ts.tv_sec * 1000000000ULL + ts.tv_nsec; \
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})
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/*
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* Pick up some kernel type conventions:
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*/
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#define __user
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#define asmlinkage
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#ifdef __x86_64__
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#define __NR_perf_counter_open 295
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#define rmb() asm volatile("lfence" ::: "memory")
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#define cpu_relax() asm volatile("rep; nop" ::: "memory");
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#endif
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#ifdef __i386__
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#define __NR_perf_counter_open 333
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#define rmb() asm volatile("lfence" ::: "memory")
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#define cpu_relax() asm volatile("rep; nop" ::: "memory");
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#endif
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#ifdef __powerpc__
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#define __NR_perf_counter_open 319
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#define rmb() asm volatile ("sync" ::: "memory")
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#define cpu_relax() asm volatile ("" ::: "memory");
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#endif
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#define min(x, y) ({ \
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typeof(x) _min1 = (x); \
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typeof(y) _min2 = (y); \
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(void) (&_min1 == &_min2); \
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_min1 < _min2 ? _min1 : _min2; })
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extern asmlinkage int sys_perf_counter_open(
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struct perf_counter_hw_event *hw_event_uptr __user,
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pid_t pid,
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int cpu,
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int group_fd,
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unsigned long flags);
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#define MAX_COUNTERS 64
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#define MAX_NR_CPUS 256
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#define EID(type, id) (((__u64)(type) << PERF_COUNTER_TYPE_SHIFT) | (id))
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static int system_wide = 0;
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static int nr_counters = 0;
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static __u64 event_id[MAX_COUNTERS] = {
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EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK),
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EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES),
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EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS),
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EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS),
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EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES),
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EID(PERF_TYPE_HARDWARE, PERF_COUNT_INSTRUCTIONS),
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EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_REFERENCES),
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EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_MISSES),
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};
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static int default_interval = 100000;
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static int event_count[MAX_COUNTERS];
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static int fd[MAX_NR_CPUS][MAX_COUNTERS];
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static int tid = -1;
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static int profile_cpu = -1;
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static int nr_cpus = 0;
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static int nmi = 1;
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static int group = 0;
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static unsigned int page_size;
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static int zero;
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static int scale;
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static const unsigned int default_count[] = {
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1000000,
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1000000,
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10000,
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10000,
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1000000,
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10000,
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};
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static char *hw_event_names[] = {
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"CPU cycles",
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"instructions",
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"cache references",
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"cache misses",
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"branches",
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"branch misses",
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"bus cycles",
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};
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static char *sw_event_names[] = {
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"cpu clock ticks",
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"task clock ticks",
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"pagefaults",
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"context switches",
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"CPU migrations",
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"minor faults",
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"major faults",
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};
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struct event_symbol {
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__u64 event;
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char *symbol;
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};
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static struct event_symbol event_symbols[] = {
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES), "cpu-cycles", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES), "cycles", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_INSTRUCTIONS), "instructions", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_REFERENCES), "cache-references", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_MISSES), "cache-misses", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS), "branch-instructions", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS), "branches", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_MISSES), "branch-misses", },
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{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BUS_CYCLES), "bus-cycles", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK), "cpu-clock", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK), "task-clock", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS), "page-faults", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS), "faults", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MIN), "minor-faults", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MAJ), "major-faults", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES), "context-switches", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES), "cs", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), "cpu-migrations", },
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{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), "migrations", },
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};
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#define __PERF_COUNTER_FIELD(config, name) \
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((config & PERF_COUNTER_##name##_MASK) >> PERF_COUNTER_##name##_SHIFT)
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#define PERF_COUNTER_RAW(config) __PERF_COUNTER_FIELD(config, RAW)
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#define PERF_COUNTER_CONFIG(config) __PERF_COUNTER_FIELD(config, CONFIG)
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#define PERF_COUNTER_TYPE(config) __PERF_COUNTER_FIELD(config, TYPE)
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#define PERF_COUNTER_ID(config) __PERF_COUNTER_FIELD(config, EVENT)
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static void display_events_help(void)
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{
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unsigned int i;
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__u64 e;
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printf(
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" -e EVENT --event=EVENT # symbolic-name abbreviations");
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for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
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int type, id;
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e = event_symbols[i].event;
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type = PERF_COUNTER_TYPE(e);
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id = PERF_COUNTER_ID(e);
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printf("\n %d:%d: %-20s",
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type, id, event_symbols[i].symbol);
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}
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printf("\n"
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" rNNN: raw PMU events (eventsel+umask)\n\n");
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}
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static void display_help(void)
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{
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printf(
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"Usage: perfstat [<events...>] <cmd...>\n\n"
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"PerfStat Options (up to %d event types can be specified):\n\n",
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MAX_COUNTERS);
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display_events_help();
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printf(
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" -l # scale counter values\n"
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" -a # system-wide collection\n");
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exit(0);
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}
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static char *event_name(int ctr)
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{
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__u64 config = event_id[ctr];
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int type = PERF_COUNTER_TYPE(config);
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int id = PERF_COUNTER_ID(config);
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static char buf[32];
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if (PERF_COUNTER_RAW(config)) {
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sprintf(buf, "raw 0x%llx", PERF_COUNTER_CONFIG(config));
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return buf;
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}
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switch (type) {
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case PERF_TYPE_HARDWARE:
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if (id < PERF_HW_EVENTS_MAX)
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return hw_event_names[id];
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return "unknown-hardware";
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case PERF_TYPE_SOFTWARE:
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if (id < PERF_SW_EVENTS_MAX)
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return sw_event_names[id];
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return "unknown-software";
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default:
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break;
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}
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return "unknown";
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}
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/*
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* Each event can have multiple symbolic names.
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* Symbolic names are (almost) exactly matched.
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*/
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static __u64 match_event_symbols(char *str)
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{
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__u64 config, id;
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int type;
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unsigned int i;
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if (sscanf(str, "r%llx", &config) == 1)
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return config | PERF_COUNTER_RAW_MASK;
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if (sscanf(str, "%d:%llu", &type, &id) == 2)
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return EID(type, id);
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for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
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if (!strncmp(str, event_symbols[i].symbol,
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strlen(event_symbols[i].symbol)))
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return event_symbols[i].event;
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}
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return ~0ULL;
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}
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static int parse_events(char *str)
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{
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__u64 config;
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again:
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if (nr_counters == MAX_COUNTERS)
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return -1;
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config = match_event_symbols(str);
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if (config == ~0ULL)
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return -1;
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event_id[nr_counters] = config;
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nr_counters++;
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str = strstr(str, ",");
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if (str) {
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str++;
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goto again;
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}
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return 0;
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}
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/*
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* perfstat
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*/
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char fault_here[1000000];
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static void create_perfstat_counter(int counter)
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{
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struct perf_counter_hw_event hw_event;
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||
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|
|
||
|
|
memset(&hw_event, 0, sizeof(hw_event));
|
||
|
|
hw_event.config = event_id[counter];
|
||
|
|
hw_event.record_type = 0;
|
||
|
|
hw_event.nmi = 0;
|
||
|
|
if (scale)
|
||
|
|
hw_event.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
|
||
|
|
PERF_FORMAT_TOTAL_TIME_RUNNING;
|
||
|
|
|
||
|
|
if (system_wide) {
|
||
|
|
int cpu;
|
||
|
|
for (cpu = 0; cpu < nr_cpus; cpu ++) {
|
||
|
|
fd[cpu][counter] = sys_perf_counter_open(&hw_event, -1, cpu, -1, 0);
|
||
|
|
if (fd[cpu][counter] < 0) {
|
||
|
|
printf("perfstat error: syscall returned with %d (%s)\n",
|
||
|
|
fd[cpu][counter], strerror(errno));
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
hw_event.inherit = 1;
|
||
|
|
hw_event.disabled = 1;
|
||
|
|
|
||
|
|
fd[0][counter] = sys_perf_counter_open(&hw_event, 0, -1, -1, 0);
|
||
|
|
if (fd[0][counter] < 0) {
|
||
|
|
printf("perfstat error: syscall returned with %d (%s)\n",
|
||
|
|
fd[0][counter], strerror(errno));
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int do_perfstat(int argc, char *argv[])
|
||
|
|
{
|
||
|
|
unsigned long long t0, t1;
|
||
|
|
int counter;
|
||
|
|
ssize_t res;
|
||
|
|
int status;
|
||
|
|
int pid;
|
||
|
|
|
||
|
|
if (!system_wide)
|
||
|
|
nr_cpus = 1;
|
||
|
|
|
||
|
|
for (counter = 0; counter < nr_counters; counter++)
|
||
|
|
create_perfstat_counter(counter);
|
||
|
|
|
||
|
|
argc -= optind;
|
||
|
|
argv += optind;
|
||
|
|
|
||
|
|
if (!argc)
|
||
|
|
display_help();
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Enable counters and exec the command:
|
||
|
|
*/
|
||
|
|
t0 = rdclock();
|
||
|
|
prctl(PR_TASK_PERF_COUNTERS_ENABLE);
|
||
|
|
|
||
|
|
if ((pid = fork()) < 0)
|
||
|
|
perror("failed to fork");
|
||
|
|
if (!pid) {
|
||
|
|
if (execvp(argv[0], argv)) {
|
||
|
|
perror(argv[0]);
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
while (wait(&status) >= 0)
|
||
|
|
;
|
||
|
|
prctl(PR_TASK_PERF_COUNTERS_DISABLE);
|
||
|
|
t1 = rdclock();
|
||
|
|
|
||
|
|
fflush(stdout);
|
||
|
|
|
||
|
|
fprintf(stderr, "\n");
|
||
|
|
fprintf(stderr, " Performance counter stats for \'%s\':\n",
|
||
|
|
argv[0]);
|
||
|
|
fprintf(stderr, "\n");
|
||
|
|
|
||
|
|
for (counter = 0; counter < nr_counters; counter++) {
|
||
|
|
int cpu, nv;
|
||
|
|
__u64 count[3], single_count[3];
|
||
|
|
int scaled;
|
||
|
|
|
||
|
|
count[0] = count[1] = count[2] = 0;
|
||
|
|
nv = scale ? 3 : 1;
|
||
|
|
for (cpu = 0; cpu < nr_cpus; cpu ++) {
|
||
|
|
res = read(fd[cpu][counter],
|
||
|
|
single_count, nv * sizeof(__u64));
|
||
|
|
assert(res == nv * sizeof(__u64));
|
||
|
|
|
||
|
|
count[0] += single_count[0];
|
||
|
|
if (scale) {
|
||
|
|
count[1] += single_count[1];
|
||
|
|
count[2] += single_count[2];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
scaled = 0;
|
||
|
|
if (scale) {
|
||
|
|
if (count[2] == 0) {
|
||
|
|
fprintf(stderr, " %14s %-20s\n",
|
||
|
|
"<not counted>", event_name(counter));
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (count[2] < count[1]) {
|
||
|
|
scaled = 1;
|
||
|
|
count[0] = (unsigned long long)
|
||
|
|
((double)count[0] * count[1] / count[2] + 0.5);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK) ||
|
||
|
|
event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK)) {
|
||
|
|
|
||
|
|
double msecs = (double)count[0] / 1000000;
|
||
|
|
|
||
|
|
fprintf(stderr, " %14.6f %-20s (msecs)",
|
||
|
|
msecs, event_name(counter));
|
||
|
|
} else {
|
||
|
|
fprintf(stderr, " %14Ld %-20s (events)",
|
||
|
|
count[0], event_name(counter));
|
||
|
|
}
|
||
|
|
if (scaled)
|
||
|
|
fprintf(stderr, " (scaled from %.2f%%)",
|
||
|
|
(double) count[2] / count[1] * 100);
|
||
|
|
fprintf(stderr, "\n");
|
||
|
|
}
|
||
|
|
fprintf(stderr, "\n");
|
||
|
|
fprintf(stderr, " Wall-clock time elapsed: %12.6f msecs\n",
|
||
|
|
(double)(t1-t0)/1e6);
|
||
|
|
fprintf(stderr, "\n");
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void process_options(int argc, char **argv)
|
||
|
|
{
|
||
|
|
int error = 0, counter;
|
||
|
|
|
||
|
|
for (;;) {
|
||
|
|
int option_index = 0;
|
||
|
|
/** Options for getopt */
|
||
|
|
static struct option long_options[] = {
|
||
|
|
{"count", required_argument, NULL, 'c'},
|
||
|
|
{"cpu", required_argument, NULL, 'C'},
|
||
|
|
{"delay", required_argument, NULL, 'd'},
|
||
|
|
{"dump_symtab", no_argument, NULL, 'D'},
|
||
|
|
{"event", required_argument, NULL, 'e'},
|
||
|
|
{"filter", required_argument, NULL, 'f'},
|
||
|
|
{"group", required_argument, NULL, 'g'},
|
||
|
|
{"help", no_argument, NULL, 'h'},
|
||
|
|
{"nmi", required_argument, NULL, 'n'},
|
||
|
|
{"munmap_info", no_argument, NULL, 'U'},
|
||
|
|
{"pid", required_argument, NULL, 'p'},
|
||
|
|
{"realtime", required_argument, NULL, 'r'},
|
||
|
|
{"scale", no_argument, NULL, 'l'},
|
||
|
|
{"symbol", required_argument, NULL, 's'},
|
||
|
|
{"stat", no_argument, NULL, 'S'},
|
||
|
|
{"vmlinux", required_argument, NULL, 'x'},
|
||
|
|
{"zero", no_argument, NULL, 'z'},
|
||
|
|
{NULL, 0, NULL, 0 }
|
||
|
|
};
|
||
|
|
int c = getopt_long(argc, argv, "+:ac:C:d:De:f:g:hln:m:p:r:s:Sx:zMU",
|
||
|
|
long_options, &option_index);
|
||
|
|
if (c == -1)
|
||
|
|
break;
|
||
|
|
|
||
|
|
switch (c) {
|
||
|
|
case 'a': system_wide = 1; break;
|
||
|
|
case 'c': default_interval = atoi(optarg); break;
|
||
|
|
case 'C':
|
||
|
|
/* CPU and PID are mutually exclusive */
|
||
|
|
if (tid != -1) {
|
||
|
|
printf("WARNING: CPU switch overriding PID\n");
|
||
|
|
sleep(1);
|
||
|
|
tid = -1;
|
||
|
|
}
|
||
|
|
profile_cpu = atoi(optarg); break;
|
||
|
|
|
||
|
|
case 'e': error = parse_events(optarg); break;
|
||
|
|
|
||
|
|
case 'g': group = atoi(optarg); break;
|
||
|
|
case 'h': display_help(); break;
|
||
|
|
case 'l': scale = 1; break;
|
||
|
|
case 'n': nmi = atoi(optarg); break;
|
||
|
|
case 'p':
|
||
|
|
/* CPU and PID are mutually exclusive */
|
||
|
|
if (profile_cpu != -1) {
|
||
|
|
printf("WARNING: PID switch overriding CPU\n");
|
||
|
|
sleep(1);
|
||
|
|
profile_cpu = -1;
|
||
|
|
}
|
||
|
|
tid = atoi(optarg); break;
|
||
|
|
case 'z': zero = 1; break;
|
||
|
|
default: error = 1; break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (error)
|
||
|
|
display_help();
|
||
|
|
|
||
|
|
if (!nr_counters) {
|
||
|
|
nr_counters = 8;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (counter = 0; counter < nr_counters; counter++) {
|
||
|
|
if (event_count[counter])
|
||
|
|
continue;
|
||
|
|
|
||
|
|
event_count[counter] = default_interval;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int cmd_stat(int argc, char **argv, const char *prefix)
|
||
|
|
{
|
||
|
|
page_size = sysconf(_SC_PAGE_SIZE);
|
||
|
|
|
||
|
|
process_options(argc, argv);
|
||
|
|
|
||
|
|
nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
|
||
|
|
assert(nr_cpus <= MAX_NR_CPUS);
|
||
|
|
assert(nr_cpus >= 0);
|
||
|
|
|
||
|
|
return do_perfstat(argc, argv);
|
||
|
|
}
|